With the scene in "Second Chances", it was not a panning shot with the two Riker's. It started off with "yellow" Riker entering into engineering by the warp core, followed him to the table and was locked off there before "red" Riker even entered the shot (but it did lead upto the 4th last picture in Tosk's link). Unfortunately it looks worst in motion than in that screen cap. And I've compared the "Wishes Were..." Scene, and while there is some softness in that scene, it is not as bad as in SC.
Hmm, well, the good news at least is that the softening should have be fixed by CBS Digital when they recomposited the footage with modern digital tools for the S6 Blu-ray release.